Furnace for burning refuse.



J. A. FRIED. FURNACE FOR BURNING REFUSE.

APPLIOATION FILED FEB.19, 1909.

2 SHEETS'AHEET 1 Patented Sept. 5, 1911.

FRIED. FURNACE-FOR BURNING REFUSE. APPLICATION FILED FEB.19, 1909.

Patented Sept. 5, 1911.

2 SHBETS-SHEET Z.

t en ran -r enter.

JOHANN ALOYS FRIED,

OF BARMEN, GERMANY, ASSIGNOR, BY DIRECT AND MESNE ASSIG-NiViENTS, OF TVVO-THIRDS T M11}:- BOUCHSEIN, OF NEW YORK, N. Y.

FURNACE FOR BURNING- REFUSE.

Specification of Letters Patent.

Patented Sept. $5, till Application fi1ed February 19. 1909. Serial No. 438.949.

To all whom it may concern:

Be it known that l. Jonnzx Arm's Fiuun. a citizen of the German llinpire. residing); at larnien. in the lrorince o't' lthenish Prusnew and useful improvements in Furnaces for Burning ltetns and [do hereby declare the following to be a toll clear. and exact description of the invention. such as will enable others skilled in the art to which it appertains toinake and use the same. 7 i This invention relates toan apparatus for burning house and street refuse and similar materials including cnhn or coatretuse or other low grade fuel or refuse o't interior heat producingquality. which howerer still contains so much carbon and cmnbustible ihatter that under proper treatment and in.

properly constructed turnaces they are capable of being burned. eren without the addition of coal or proper .tuel. and. if so treated. insteal of being a nuisance and burden may he turned to useful purpeses as for heating steam boilers or such like heating purposes. while the ashes tor-med thereby may constitute a valuable building material tor making concrete in place of sand or mortar.

The house and street refuse. in the following for siniplicitys sake willed dust it comes from the kitchens and is gathered on the roads. thus containing regetahle and other kitchen offal cinde -s. ashes. tin boxes, broken glass, earthenware, paper bits, straw and other waste from factories and so on, Without being cleaned. dried or separated in anyway is thrown in large quantities, say 400 to (300 kilograms. at a time in a furngice in which the fuel. contained in the dust /it; burned absolutely and the treating gases "produced are free from fine ashes carried by the sam after they have given oil the heatv contained in them without being able to torin injurious deposits on the heat. transinitting surfaces of the steam generator. so

that the ashes which in boilers and other furnaces hitherto were considered as a nuisance by the. apparatus of the applicantare even turned to useful etleet. The dust 5O thrown on the grate which is preferably of special trough-shape design where it is burned-and gasified by the use of heated fresh air (primary air): it is then drawn forward on. a grate .t'orniing as one may say the front'partof the trough shaped grate and here the heat contained in these slags and cinders is utilized to heat to a very high degree =.-.n:lher part o't' 't'resh air-.wlrivh at l the saline time cools down these heated slags. 5 sia, Prussia, Gerumnr. have invented certain and which is blown into the carbonous oxid gases produced on the hind part (trough) of the grate. there mixing and burning with these gases to carbonic acid in a mixing chamber above the trough-shaped grate and producing the highest degree o'lt' heat. Now it is a known fact that above 1000" t. carbonic acid is again decomposed into carbon and oxygen and therefore the addition of secondary hinted air necessary. trout thence the hot gases together with the tine ashes ("tiring ashes) carried otl by them are carried around a vertical tubular boiler npward and then through the line tubes in the same downward so that the heat contained in the ashes is also utilized andthe ashes are then deposited on a sloping t'ioor under ueath the boiler from which tloor they can be drawn oil through a door in the trout wall of the boiler brickwork. whereas the cooled and inert gases iiow oil through a separate flue into'the chimney. i

The furnace used for :arrving out. the

above is shown in the accoinpanving drawings. in V\'l1l(,l'l--- v Figure l is a .rertieal section on the line l--I of Fig. 2 and Fig. 2 is a horizontal section on the broken line II-l.I-II 0t Fig. 1. Fig. 3 is a cross section of one oi the niain grates; and Fig. 4. is a cross section of one of the tore-grates.

This furnace is also specially constructed with a view of being able to carry out repairs of the grate or replace one grate for another withoutbeing compelled to stop. the 'whole. operation or the furnaces adjacent to the detective one and for this purpose the. grate is so arranged that it can be taken out of its place as a Whole or only parts of it. by being suspended on a pulley block going down through the feeding funnel and left down into a special pit. or channel below the grate. Where the defective pieces can be repaired or replaced by new ones Without the operation heing stopped or the laborers being hindered by the heat of the adjacent furnaces or hindering themselves. the stoking and firing going on in the other fur naces. it found necessary this channel may be cooled by fresh air blown into the same by a fan or blower.

This is of great importance because by these means the work can be carried on without interruption and the accumulation oflarge masses of dust which are gathered daily in a city of only medium size is avoided; the transportation of heavy pieces (a grate of medium size for the new furnace Weighs about 1900 or 2000 kilograms) is""avoided or it can be carried out so easily by the use of pulley blocks by which the grate can be suspended that two men can carry it out conveniently. 'This is of great importance considering that repairs in a dust, burning furnace are much oftener necessary than an ordinary fire place on account of the exceedingly varying circumstances under which the dust furnace is worked and the great temperatures which are produced therein.

A indicates the brickwork of the furnace proper and of the boiler; B is the inner lining of the wall of refractory bricks. The furnace shown has three grades 0 placed side by side. More or less may be arranged,

' depending on the quantity of dust which has to be burned per day. Each grate is composed of two distinct parts, namely the part C of trough shape and the front part C consisting of a, flat grate surface.

On to this grate, part of the fuel may rolland is burned there. Immediately above the part- C is a filling, burning, collecting and mixing space D, which is covered byan arched roof E and approximately centrally above the grate C is the filling or feeding hole F of the furnace made in the roof of the furnace. This feeding hole is funnel shaped, so as to allow large quantities of dust to be thrown into the' same at a time and ts bottom outlet is closed by a lid or cover in the shape of a cylinder or drum G which can be raised and lowered by means of a chain and roller gear H on which it is suspended overhead. It will be seen that when the funnel F is filled with dust it re-. cover in the shape of a cylinder or drum G to allow the contents of the funnel to fall down freely on the hearth C when the drum G can again be lowered and close the vfeed hole, and it will be understood that during the feeding operation hardly any gas can escape and hardly any cold air will enter, which mightv influence the temperature in the furnace sensibly. The space above the front part C of the grate is also covered by an arched roof E but this space D is considerably lower than the space D'above the trough C On to the grate C the burned out remnants of the dust from the hearth C slags, ashes and cinders are drawn, there to be cooled by fresh air, which is blown into and through the same and which thereby is highly heated at the same time, thus utilizing profitably all the heat contained in the slags.

For this purpose and also for leading fresh the grate part C in the air to the dust on the hearth C I arrange underneath the grate, which is of such construction as will allow air to be forced. into it from the sides or bottom, instead of the usual ash pit a deep space or working room L which runs crosswise along underneath all the grates C and in which the air pipes M as well as other piping, water pipes for the water pockets of the trough grate and other requisites and measuring instruments not shown, but necessary or practical for the working of the furnace are lodged. This channel L besides this serves another very important purpose as will be explained farther on.

From the main air pipe M branch pipes M and M are branched off which lead the compressed air into distributing boxes N and N of known design from which the air is blown and evenly distributed into the dust on the hearth C and into the slags on Valves M are placed pipes l 1 and M for regulating the draft. It; will thus be understood that no ashes can fall down into the room L on account of the boxes N}, N and also that the fresh air blown through the slags or over them is highly heated on the grate part C and burns the rest of the carbon in the slags. The fresh air above mentioned can then escape throughthe upper part of the space D into the space D and through the upper part of the dustand into the free space above it where the monoxid of carbon from hearth C is collected and will be mixed, here with these gases, so that they will be burned to carbonic acidgas so that by this process the highest degree of heat is developed evenly in the center part of the dust heap on the grate so that in fact every-4 thing on the same, earthenware. tin boxes and other pieces of iron, is burned or melted to a uniform glassy mass forming largecompact or half fluid lumps] These highly heated gases are carried over the spaces D of all the single furnaces into a common collecting chamber 0 where they are still better mixed in consequence of the different directions in which they enter therein as indicated by the arrows andif such should be the case-the still unburned or unmixed gases are now quite intimately and finally mixed with the oxid-gases. Said collecting chamber 0 is separated from the boiler setting space by a sort of battle wall P at the rear side of chamber 0 which leaves a comparativcly narrow opening Q to permit only the gases to enter in the boiler setting space. This forms a sort. of pit in which the vertical tubular boiler R is so erected, that the heating gases con'iingfrom the chamber 0 first'flow along the front half outside of the boiler shell .upward in the flue S, then down in the boiler through the tubes S in the same and finally upward again along; the rear ,part of theboiler by brick feathers 13 between the boiler, and walt-wlaence they escape through the door T into a channel. which conducts them to a chimney. In the flue is steam superheat b g pipes S may be arranged as indicated in the drawing.

The fine ashes carried away by the draft of gases will not adhere to the vertical sides of the boiler plates and of the tubes because these do not give any means where the ashes could rest and because these plates and sides of the tubes are always cooled by the water inside of the boiler therefore they can not burn it' st on those plates; they are on the contrary deposited on the sloping bottom W below the boiler and can be scraped out thence through a door X into. a vehicle and.

a glut e has to be replaced by another, the comma:- lions of the piping with the grate uninc and also other fixing parts; the drum is put on o e side and the chain and pulley blocks lined overhead on the bracket 1'3", "which also holds the chain roller l'li are let down through the furnace and the grate fixed thereon in any suitable and onvenient manner mid it is then litled out o'l. place and (ll-coped dean's. into the re ur L where the repairs can be nnnle as 1 ated aluwe. in the same can and convenient manner the repaired or new ratc can be put again in place; no brick r irlt need be destroyed can be done in relatively harm. The grate need not be 7 rent o'l the 'li'urnace where it '"ider the workmen and be in the laborers ea, ring oil the slugs i illl'llil and so in order ndrances would have to ,e repairs. ipiion fi\(-ll and from the it w ll be iuidrrstood that consume the dust, to utilize the .l during: the 'ljinrning of the "'i W l {villi shell ln the- JS called the-main graite and CT is the liores:

flue t l -the lines and S" being separated ner with ashes from the front r le pri'ihtable use of even the gi.'ate; ,=wl-iicli forms an extension frmirthe main grate v p g i v Gn April 29, 1)l0, applicant filed a (l'ivisional application Serial No. SSSLl-SJ, in' which be inserted process claims .canceled' from this application; Having thus described my invention what I claimv as new and desire to secure by Letters Patent is: I 1. A refuse burning 'lurnace having a main combustion chamber provided with an extension, :1 main grate in said .clunnber. a" :t'oregrate fori'ninp a continuation or exten sion of the main grate and located vin the'SO said extension of the main combustion chanihen the t'oregratc being arranp jml to receive the slagged material from the main grate, and means for siuvplying air to the toregrate, the two grates being so arranged that '85 the heated air from the :toreg ate will en' J tor the main combustion chamber above the fuel bed therein and mingle with the gases of con-ibustion therein; substantially as do"- scribed, I i i A refuse burning; .turmicc having- ::a main combustion chamber provided with an extension, a main grate in said chamber a l foregrate forming a continuation or cxten- Si011 of the main grate and located in the saidextci 'ion of the naincon'ibustion chain-y her the it'orcgrate being arranged to receive the slafa' ed material 'lllOll'l the main grate, and means tor su n'ilying a regulatedarnonnt 1 of air to both grates, the twogrates being so arranged that the heated air from "the torcgrate will enter the main. combustion chamber above the fuel bed therein and n'iing'le with the gases of combustion therein; substantially as described. 7

3.1K refuse burning furnace having a main coi'i'ibustion chamber provided with an oxtcnsioi'u a main grate in said chamber, grate being trough-shaped and having" a plurality ot ope,iiiii c. in its sides, a foregrate forming a continuatioi'i or extension of the main e'rate and located in a chain ber harming an extension of the main coinbustion chamber, the to're rate being}; arran fl to receive the slag; :d material from the main grate and means for sup 'ilying air to the :loriui ratc, the two grates being so arranged that the heated air from the thregrate will enter the main combustion chamber above the fuel bed therein and mingle with the oil combustion therein. substantially as described. l

4.- A refuse burning furnace having a main combustion chamber n'ovided with an extension, a'main grate in said chamber, 1 said grate being trough-shaped With terraced sides having inwardly directed air openings at different levels, a toii'egrate forming a continuation or extension of the main grate and located in the said eXten sion' of the main combustion chamber which opens 1ntov said main chamber, the foregrate be1ng arranged to receive the slagged material from the main grate, and means for supplying air to the foregrate, the two grates being so arranged that the heated air from the foregrate will enter the main combustion chamber above the fuel bed therein and mingle with the gases of combustion therein, substantially as described.

'5. A refuse burner having a plurality of cells or chambers, each chamber having a trough-shaped main grate with air holes in the side thereof and a feeding hole through which the refuse is. fed, each chamber also having an extension containing a fore-grate upon which-the slagged material may be drawn from the main grate, the fore grate having an air chamber with outlets, connections for supplying air under pressure to both grates, and a combustion passage or chamber having ports leading from the several cells or combustion chambers; substantially as described. i

6. Arefuse burning furnace havinga main combustion chamber provided with an extension, a main gratein said chamber, a foregrate forming a continuation or extension of the main grate and located in the said extension of the main combustion chamber whichv extension opens into said chamber, the foregrate bein arranged to receive the slagged material rom the main grate, means for supplying air to the foregrate, the two grates being so arranged that the heated air from the fore .grate Will enter the main combustion chamber above the fuel bed therein and mingle with the gases of combustion therein, together with a boiler, and means for conducting the gases from the main combustion chamber into heating contact with the boiler, substantially as described.

7. A refuse burner having a series of cells or chambers, each chamber having a main grate of trough-shape with side air openings and also having an extension, a feeding hole through which the refuse is fed, and a fore grate in said extension and upon which the slagged material maybe drawn from the main grate, each fore grate grate, each fore grate being arranged to receive the slagged material from its main ate, a separate air chamber for each fdre grate and each main grate, each of the grates having openings in communipassage to which ports lead cation with one of the air chambers,meanstosupply airunder pressure to each of'theairchambers, separatemeans for controlling 'the supply of air to each air chamber, the air from the foregrate air chambers being heated by contacting with the slagged material on the fore grates and then passing to the material on its resp'ectivem-ain grate, and a common combustion'chamber or passage arranged to receive the products from the cells; substantially 'as' described.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

J. ALOYS FRIED. a s.]

Witnesses:

O'rro K'ome, Orro SCHUMACHER. 

